I'm running debian unstable for 15+ years and usually perform an apt upgrade
manually about once per week.  Yesterday I upgraded again, and suddenly after
the upgrade, xserver-xorg-input-{evdev,libinput} were no longer present, meaning
that I could not even enter my username in the display manager (wdm) after system reboot.

No input was possible from either the built-in laptop/touchpad of my Lenovo x260 keyboard/trackpad,
nor from externally-attached mouse + keyboard.

Luckily I'm technically skilled enough to boot into rescue mode, look at Xorg.0.log,
see that no drivers were found for any of the input devices and then apt install
the evdev + libinput packages.

However, for most other users this would render their systems unusable, hence I'm marking
the bug as 'important'.

So somehow during the continuous unstable upgrades (which I'm doing for something like 4 years
on this laptop) decided that neither evdev nor libinput is a package to keep through the most
recent dist-upgrade + autoremove I ran yesterday.  Maybe a missing depends/recommends somewhere?